Oil screen



March 27, 1945. M. A. MIERAS OIL SCREEN Filed 001;. 12, 1940 FIGJ.

FIG.2.

FIG.3.

INVEN T OR.

ATTORNEYS i j iJNl'i'ED STATES PATENT OFFICE omscasss IerrittLIiesas,

county.

'nesrusron-amwune mar-mum m Cloth ,w

occurtothoseskilledintheartuponreierence to the following description and the accompanying drawing in which Figure l is a vertical central section through the device showing its installation in the crankcaseoianautomobileengine. I l'igure 2 is' an elevational view with the crankcase parts in section. l'igureiiisasectiononlineh-lofl'isurel.

be easily and eileotively outi'romthecoverltandbent ,osm aimJumsamm (Claims. (c1. zit-:11.)

screensior slidereadiiyoverpipei'lbutbeaubstantiafiyiilled thereby v 'lheopeningllshouldbeaslargeasisconvenient and the valve It may, as shown, consist oi'aiiexiblemetalplateiisedatone'endtothe cover ltbymeansoisuitabletonguesllpunched overtheendportionila oithevalve plate.

l'ixedtothepiliel'lissbellflwhichextends down overthescreenlltoashortdistance above ringll,andissumcientlylargerthanthescreen toprovideaspacelltopermitoiltopassireely 7 therebetween. The pipe is, as indicated, connected to the pipe 21a leading Inthedrawing,aportionoianenginecrank-.

case is shown at II, this being preicrabLv the lowest portion and forming an oil sump. In the bottomwallisilxedathreadedringii into which is screwed a suitable plug it or somewhat larger diameter than the screen and sealed by a gasket ll.

Surrounding theopening for plug I2 is a shield in the form-oi a metal ring ii, which, by means oi a flange II is preferably iixed to the crankcase It as by spot welding. This ring II, as shown in Figures 1 and 2, comprises an outer vertical wall ll provided with a plurality of large openings it, and spaced a short distance from the plug opening. It also is providedwith a downwardly sloping upper imperiorate wall ll having at its inner periphery ashort depending flange II, preferably slightly rounded as shown. 'I'heloweredgeotiiangeflshouldbespaced from ring ii to provide an annular opening llb. The ring ll provides a shielded space "a outside of the influence oi the oil flow and adjacent the opening in the crankcase.

Fixedtoplugliisanupstandingsubstantially.

cylindrical screen 2! having its lower edge portion 25a sealed with solder up to the level of wall it and having a cover plate It provided with an opening for a suction pipe 21 and also with an opening 2! normally closed by a valve 28. The opening ineover it should be oi-suchsise as to inletpipeoi'theoilcirculatingsystemoranento the suction side of an oil pump (not shown).

In the operation of the device, any heavy particles in the oilsand, grit. metal. particles, etc. settling out oi. the oil will naturally travel along the sloping bottom or.the crankcase and into the space "it.

It and when the screen II becomes clogged, the

suction in pipe i! will, oi course, cause the oil to .pass up through space it and through the valved opening II.

When it is desired to clean the screen it may be readily removed as is obvious, and, when this is done, the oilin the crankcase, in flowing from the opening in the crankcase through which the screen 28 is inserted, will oi course flush the space Ila through the opening llb.

Now having described the invention and the preferred embodiment thereof, what I claim is:

1. In an engine having acrankcase provided with a sump and oil circulating means drawing oil from said sump, an inlet tube extending into said sump and leading to said circulating means,

' and mounted on said plug so as to be removable therewith. and a substantially horizontal plate surrounding said screen and spaced from the bottom of said sump whereby heavy dirt particles may pass under said plate to adjacent said cleanoutpllmsaidplatebeingnxedto awalloiandwithin said sump. I-

2. In combination with'the oil sump and oil gine, a cleanout plug for said sump, a substantially cylindrical screen mounted thereon and Provided with a cover perforated to receive said inlet pipe, a plate iixed within said sump around the opening for said plug and spaced from the bottom oi! the sump whereby heavy dirt particles maypassimdersaidplatetoadiacentsaidcleam. out plus. saidplate being provided with an opening or substantially the same size as said screen and an inwardly opening normally closed valve in said cover whereby when'pressure within said screen drops below normal oil may flow into the space within the screen withoutlpassing through thelatter. 4 I

3. In combination with theoil sump and oil inlet pipe of the oil circulating system of an en'- gine, a cleanout plug for said sump, a substantially cylindrical screen mounted thereon and provided with a cover perforated to receive said inlet pipe, a plate supported 'upon the bottom of said sump around the opening for saidplug and spaced from the bottom oithe sump, said plate being provided with an'openins oi substantially the same size as said screen and through which said screen extends. and a bell fixed to said pipe and extending over said screen and spaced therefrom and having its lower edge spaced from said plate.

4. In combination with the oil sump and oilinlet pipe of the oil circulatinl system of an ensine, a clean-out plug for said sump. a substantially cylindrical screen mounted thereon and having a cover plate provided with a-ilanged opening, to receive said inlet pipe and adapted to tit closely therearound, a' plate nxed within said sump around the openins for said plug and spaced from; the bottom of the sump, said plate being provided with an opening of substantially the same size as said screen and fitting closely around the latter, and an inwardly opening normally closed valve in said cover whereby to bypass oil when said screen becomes clogged. 

